Good one, new to me. I once saw a sink hole (pot hole on steroids!) swallow a car some thirty feet deep on US 2 in da UP. Lots of iron mines up there and some of the stopes got real close to the surface. Well, given enough time, even rock gets tired! This poor lady was zipping along about 10:00 pm when the roof fell in.
Damn, don't you just hate it when that happens.
Regards,
GtG
I once saw a sinkhole swallow a parking lot, and kill two people. (Not actually witnessed it, just the aftermath) Also took down the front half of a Hyatt Hotel. Happened all at once. 80 feet deep 150 feet long and 75 feet wide